His rite of spring was known for irregularity, but I am not sure about the details..
<span> In “The Rite of Spring” Stravinsky turned the musical hierarchy up side down The melody is (mostly snippets and shards, turned
this way and that, as a Cubist would an object) and harmony (bi-tonal)
in service to it.</span>
After Lennon's death the idea of reunion practically vanished.
Still, Paul McCartney, Star and Harrison got together during their work on "Free as a Bird" (which included the vocals of the late Lennon) for "Anthology 1", released in 1995, and for "Real Love" for "Anthology" 2 ”from 1996.